JP2007168442A - Drying device of sheet-fed rotary printing press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a drying device of a unit-type sheet-fed rotary printing press comprising at least one paper feeding/drying cylinder and a dryer mounted on the drying cylinder, wherein economical expense for a modular-type drying device can be reduced. <P>SOLUTION: The drying device of a sheet-fed rotary printing press is provided in which (1) a size of a side wall of a drying device and fulcrum arrangements of a sheet delivery system and a drying cylinder are made same as a size of a side wall mounted on a printing device or varnishing device and fulcrum arrangements of the sheet delivery system and an impression cylinder, (2) the drying cylinder is formed as a body frame, and an outer shell surface of a curvature radius corresponding to a radius of the impression cylinder or a varnishing cylinder composed of a single or a plurality of surfaces is mounted on the body frame through a radial web plate. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a drying device for a unit type sheet-fed rotary printing press based on the superordinate concept of the first claim.

The arrangement of at least one separate drying device in front of the paper discharge device for strong ink or varnish drying is known from German patent DE29623064. For this purpose, a modular drying device is installed in a standardized substructure module instead of an ink or varnish device. This lower module also constitutes the base of a printing or varnishing device arranged in front of it. The substructure module for the printing or varnishing device is equipped with an impression cylinder. Based on the high demands on printing accuracy and the load in the printing or varnishing process, the impression cylinder has a strong structure and high manufacturing accuracy. The disadvantage of this solution is that the economic expenditure for the drying device is therefore high. A dryer module behind the last printing device for feeding sheets to the discharge pile is known from German Patent Publication DE 196 29 370 A1. The dryer module has at least one fixed dryer, and a sheet of paper is passed beside the dryer by two rotating conveying members, in which case the first conveying member (rotating conveyor) is a sheet in the conveying direction. The paper is guided freely without surface contact, and the second conveying member (delivery cylinder) guides the sheet onto the curved support member. The support member is disposed between the gripping bars in the circumferential direction, and the sheet is placed thereon. The disadvantage of this solution is that such modules can only be used in the discharge area because of the special arrangement of the printing or varnishing device and the structure of the conveying member. For example, if varnishing or double squeezing before changing the direction of the sheet, depending on the required ink or varnish application sequence, the drying device can be placed in front of the direction changing device or between the varnishing devices. It is necessary to arrange.
German Utility Model Registration Gazette DE29623064U German Patent Publication DE19629370A1 (Japanese Patent Laid-Open No. 10-58653)

  Therefore, the basis of the present invention is that it can be placed after any printing or varnishing device, regardless of its position in the printing press, and is economical for a small paper feeding means compared to a printing device module. It is a problem to provide a general-purpose drying apparatus that can be manufactured with a reasonable expenditure.

  This problem is solved according to the invention by a drying device having the features of the first claim. The proposal according to the present invention is not costly to feed the paper in the dryer because the sheet is fed through the dryer without being subjected to a mechanical compression load as in the case of a printing or varnishing device. It is based on the premise that the use of such an impression cylinder is unnecessary. Instead, standardized paper delivery systems, such as those provided for paper feeding between printing or varnishing devices, in particular paper feeding with a drying device on a delivery cylinder having a cylindrical shell surface or a cylindrical jacket. To take charge. The outer shell surface can be formed thinner than the impression cylinder, or can be manufactured from a metal plate. Furthermore, the proposed drying device is equipped with standardized side walls. This side wall is similar to the side wall of the printing or varnishing device with respect to fulcrum placement and connection dimensions. The present invention has the advantage that an inexpensive design of the drying device is obtained, since no special structure is required for the drying device by using standardized paper feeding means and standardized side walls. Moreover, by using standardized sidewalls, it is possible to place the drying device at any location between the printing or varnishing devices where intermediate or re-drying is required. In addition, since a plurality of drying devices can be sequentially arranged, high flexibility can be obtained in the arrangement of the drying devices.

  The present invention will be described in detail with an example of a sheet-fed offset rotary printing press.

  As apparent from FIG. 1, the illustrated sheet-fed offset rotary printing press includes a paper feeding device 1, five printing devices 2-6, a varnishing device 7, a drying device 8, and a paper discharge device 9. The sheets are taken out from the sheet feeding pile of the sheet feeding device 1, are stacked one by one, are arranged as a flow of sheets, and are sent to the first printing device 2. After passing through the first printing device 2, ink deposition is performed by another printing device 3. Next, the direction of the single-sided sheet is changed by the direction changing device W, and the lower side not printed is the upper side. Another partial print image is deposited on the sheet by the printing device 4-6. Finally, a varnish protective film is applied to the sheet by a varnishing device (Lackwerken) 7, and before the sheet is discharged to the discharge pile, the varnish protective film is formed by a drying device 8 having at least one dryer T1. Dried. Depending on the varnish film to be deposited, re-drying is required along the paper feed path in the paper discharge area. For this purpose, another dryer T2 is arranged along the paper feed path of the paper discharge device 9 to the paper discharge pile. In the printing device 2-6 and the varnishing device 7, the sheet is conveyed by the impression cylinder D2-D7 and printed in a printing or varnishing area including the rubber cylinder GZ and the impression cylinder D2-D7. Between the printing and varnishing device 2-7, a paper delivery system, for example a delivery cylinder U3 or a delivery cylinder U5-U8, is arranged to transport the sheet from the front apparatus to the rear apparatus. As is well known, a guide plate B close to the paper feed path can be arranged below the paper delivery systems U3 and U5-U8. The guide plate B has a nozzle opening through which air is fed. Depending on the single-sided or double-sided printing, the sheet is guided differently. A single-sided printed sheet is usually stretched by sliding the lower side, which is not printed, onto the guide plate B on which air suction works, and in this case, the sheet is printed with as little surface contact as possible. In order to guide the paper, the paper delivery system has no cylindrical jacket (passage cylinder U3) or is folded back (delivery cylinder U5-U8). The double-sided printed sheet is subjected to direction change by the direction changing device W after printing on the first side, and then printed on the second side. In this case, between the printing or varnishing device 4-7 after the direction changing device W, the sheet is fixed to or attached to a cylindrical jacket or body frame folded back to the outside. Guided by a delivery cylinder U5-U8 having a shaped outer shell surface M, the sheet is then placed and secured on the cylindrical jacket or outer shell surface M by means of an air cushion as is well known. A freshly printed printing ink or varnish set-off is avoided by the outer covering or covering which repels the ink on the cylindrical jacket or outer shell surface M of the paper delivery cylinder U5-U8.

  Since the sheet is not subjected to a mechanical load like the impression cylinder D2-D7 of the printing or varnishing device 2-7 while being transported by the delivery cylinders U3, U5-U8, the structure of the delivery cylinder is not very expensive. . As is well known, the paper delivery systems U3, U5-U8 are light-weight or skeleton structures or at least have cavities, in which case the fuselage skeleton-shaft-rigid shaft and the radial belly plate ( A paper feed outer shell surface M having a radius of curvature corresponding to the radius of the impression cylinder or varnish cylinder D2-D7, which is composed of one or a plurality of surfaces, is attached to the trunk frame. The outer shell surface M can be fixed to the trunk frame, or can be attached or detached or replaced. The detachable outer shell surface can be formed as, for example, a pivotable or replaceable cylindrical envelope. Thus, within the framework of the present invention, the drying device 8 in which the sheet is exposed to the thermal or other radiation action of the dryer T1 rather than a mechanical action as compared to the transport between the printing or varnishing devices 2-7. Therefore, it is proposed that such a paper delivery system U3, U5-U8 is also used as the drying cylinder T8. In that case, in order to guarantee a certain distance between the dryer T1 and the sheet, it is preferable to use a delivery cylinder U8 having a cylindrical jacket or a cylindrical shell surface M arranged on the outside. The outer shell surface M can be composed of one or more surface elements. For quiet paper feeding, it is advantageous if the radius of curvature of the cylindrical jacket or shell surface M corresponds to the radius of the impression cylinder D2-D7 used. By replacing the costly impression cylinder in the drying device 8 with an inexpensive drying cylinder T8 having an outer shell surface M, the economic expenditure for the production of the drying device 8 can be significantly reduced. The use of the drying cylinder T8 in the drying device 8 has another advantage. Based on the cavity or compartment structure of the fuselage skeleton of the drying cylinder 8, it is possible to improve the exhaust of the drying device 8 and to use an internal cooling system for the drying cylinder T8, for example heat sensitive printing material. The printing material cooling for can be improved. Transportation costs are reduced because the total weight of the printing press is reduced. Since the weight of the drying cylinder T8 is small, a small driving power is sufficient. The side frame of the drying device 8 receives the fulcrum for the drying cylinder T8 and the front paper delivery system, in particular the delivery cylinder U8. Since the arrangement of the delivery cylinder U8 to the side frame corresponds to the arrangement of the impression cylinder D2-D7 and the associated paper delivery systems U3, U5-U7, the drying apparatus 8 uses the same side wall as the printing apparatus 2-7. be able to. Therefore, the lower structure module of the drying device 8 is the same as the lower structure module of the printing and varnishing device 2-7. Thus, since the connection dimensions of the apparatus and the paper feed are the same, the proposed drying apparatus 8 can be inserted into an arbitrary position of the sheet-fed offset rotary printing press.

1 is a schematic view of a sheet-fed rotary offset printing press having a drying device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Paper feeder 2-6 Printing device 7 Varnishing device 8 Drying device 9 Paper discharge device B Guide plate D2-D7 Impression cylinder GZ Rubber cylinder M Outer shell surface T1, T2 Dryer T8 Drying cylinder U3 Paper delivery system, Delivery cylinder U5 -U8 paper delivery system, delivery cylinder

Claims (9)

Drying device (8) in a unit type sheet-fed rotary printing press having a printing and / or varnishing device (2-7) having an impression cylinder (D2-D7) provided with a paper delivery system (U3, U5-U7) Because
The drying device comprises a paper feed drying cylinder (T8) and a paper delivery system (U8) attached to the drying cylinder (T8);
-At least one dryer (T1) is attached to the drying cylinder (T8);
A drying device in which the drying cylinder (T8) and the paper delivery system (U8) are supported on the side wall of the drying device (8);
The dimensions of the side walls of the drying device (8) and the fulcrum arrangement of the paper delivery system (U8) and the drying cylinder (T8) are the dimensions of the side walls attached to the printing or varnishing device (2-7) and the paper delivery system (U3). , U5-U7) and the fulcrum arrangement of the impression cylinder (D3-D7),
-Paper feed with a radius of curvature corresponding to the radius of the impression cylinder or varnish cylinder (D2-D7), wherein the drying cylinder (T8) is formed in the same manner as the paper delivery system (U5-U7) and comprises one or more surfaces. It has an outer shell surface (M), the outer shell surface (M) is thinner than the impression cylinder (D2-D7), and is attached to the rotating shaft via at least two radial belly plates. A drying apparatus.   The drying apparatus according to claim 1, wherein the drying cylinder (T8) is formed of a light weight or a frame structure.   The drying apparatus according to claim 1, wherein the paper feed outer shell surface (M) is fixed to the trunk frame.   4. Drying device according to claim 3, characterized in that the drying cylinder (T8) is formed as a delivery cylinder (U5-U8) having a substantially cylindrical outer shell surface (M).   The drying apparatus according to claim 1, wherein the paper feeding outer shell surface (M) is detachably attached to the body frame.   6. The drying apparatus according to claim 5, wherein the paper feed outer shell surface (M) is composed of a plurality of partial surfaces attached to the fuselage frame so as to be pivotable.   6. The drying device according to claim 5, wherein the paper feed outer shell surface (M) is attached to the fuselage frame in a replaceable manner.   The drying device according to claim 6 or 7, characterized in that the drying cylinder (T8) is formed as a delivery cylinder (U5-U8) provided with a cylindrical jacket.   The drying apparatus according to any one of claims 1 to 8, wherein the outer shell surface (M) comprises a body plate.

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